During the 60s, the NSA built one of its largest listening stations atop "The Hill," as it came to be known by the Americans who worked there.
The following photos are by Liam Davies and used under the linked license.
Also going back to World War II, your bonus photos today are from Torpedowaffenplatz Hexengrund, Nazi torpedo testing station they built in Puck Bay in Poland after they occupied it. Although the Russians briefly occupied the base at the close of the war, the facility has been abandoned since 1945.
And one more! The abandoned Toronto Power Company Generating Station.
The following photos are courtesy of Opacity.